Malicious PDF — malware analysis report

Static analysis result for SHA-256 93516cd48c36a759…

MALICIOUS

PDF

92.9 KB Created: 2021-08-14 19:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 860edc9d3be0d88448023185f7c1cccf SHA-1: a06684ce15175ac80ff01bd135b42b4489fe1a3e SHA-256: 93516cd48c36a759816acbdb4a0009420df05b2db7e5e95f217dae777b9ab897
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised WordPress installations. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is designed as a link farm to distribute traffic to potentially malicious destinations. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e5c978202---26325312624.pdf In PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/penozigokalozokejelexas.pdfIn PDF document text
    • https://bak.vn/upload/files/wejupowubududisom.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/77c3cbbce7f93569f2aebe99c76a3bc9/32596577483.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160eca4751da81---13409275943.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609121f193adf---76573815746.pdfIn PDF document text
    • https://aashianarealty.com/file/vejadogepinotin.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/21402971731.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/63627870283.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/dijudezalewux.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210814_A7F032786CCFA80C.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/13867691278.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/jifezaxasozi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160780def14fdc---sogixebetirikufipil.pdfIn PDF document text
    • http://ore-processing.ru/d/files/1506917122.pdfIn PDF document text
    • http://abwessex.com/uploads/files/kurutipukudakowoso.pdfIn PDF document text
    • https://susta.vn/userfiles/file/63730017402.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/10453842585.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/xajuwinuxovijup.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/83318555934.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/81644958392.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/d67f14cec9e445a679cf65b98512bf73/5844745760.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/bumj0iue5rib2duatfs2iih4qs/kubesejevu.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98bf6e4fe---rasivakixexak.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/57590444758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=behringer+x32+producer+handbuch+deutschPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 11432 bytes
SHA-256: e54132e8780a4cfb60249406122031fe0eddd3ff398400dcb636d39f5f63e1c6
font_01_sfnt_off00011f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 18352 bytes
SHA-256: 1faf4180a56cd5ffd3e94b23d7cab8979259f2c8bbb94135092bb3171dfb32a1
font_02_sfnt_off00014d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1